Large Diameter Spiral Welded Pipe Production Line

Large Diameter Spiral Welded Pipe Production Line Unit Process

Uncoiling→head dismantling→lead material leveling→vertical roll centering→shear butt welding→vertical roll centering→edge milling machine→vertical roll centering→delivery→guide plate pressing→forming→inner welding→outer welding→cutting→steel pipe output

Molding process introduction

Firstly, hoist the strip steel coil to the support roller of the coiler with the crane, transport it to the center of the uncoiler frame, clamp and lift the steel coil by the left and right cone heads, and accurately move the steel coil to the center of the required delivery line through the operation button, then operate the blade to close to the steel coil, start the motor to rotate the steel coil, open the strip head with the cooperation of the blade, and send it to the pinch leveler after the initial straightening. After the strip head enters the pinch roller, the pinch roller is pressed down and the strip steel is forwarded. The strip steel is leveled by the leveling roller, and the strip steel continues to move forward. The head and tail of the strip are cut by hydraulic shears, and the front and rear steel coils are connected by automatic submerged arc welding. The two sides of the strip steel are milled by two edge milling machines to form welding gaps, and the vertical roller ensures that the strip steel is on the delivery center line. Afterwards, the strip steel enters the delivery machine, which is the total power source of the screw welding unit. It is used to generate forming force and overcome various resistances, such as uncoiling resistance, leveling resistance, forming resistance, etc., and send the strip steel into the former. The 1#, 2#, and 3# forming rollers of the former are used to force the steel plate to deform to form a steel pipe. The 4#, 5#, 6#, and 7# forming rollers are used to force the sizing of the initially formed steel pipe to produce a spiral pipe that meets the size specifications. The Lincoln submerged arc welding machine welds the inner wall and the outer wall respectively to form spiral welded pipes. The rear axle is equipped with an automatic length-setting and steel pipe cutting device. During the production process, the steel pipes are cut and pulled out according to the required length to ensure continuous production of the unit.

According to the forming theory, in the production process of spiral welded pipe, different plate widths and plate thicknesses are suitable for different diameters of steel pipes. The corresponding relationship is shown in the following formula:

cosα=B/πDm

Where: α is the forming angle

B is the width of the steel plate

Dm is the middle diameter of steel pipe, Dm=D (outer diameter of steel pipe)-t (thickness of steel plate)

In actual production, you can first calculate the required forming angle according to the above formula, then adjust the front axle to a suitable position according to the calculated value, adjust the forming roller to a suitable angle, and then start production.

Large Diameter Spiral Welded Pipe Production Line Equipment Composition

Double Cone Uncoiler

Primer leveler

Electric Vertical Roller

Shear Butt Welding Machine

Edge milling machine (including automatic collection and cutting machine)

Delivery machine (including board surface cleaning device)

Forming Machine

Centralizer